In recent years，urban rail transit has developed rapidly in Beijing，but there are some outstanding problems. First，the spatial layout needs to be improved. The degree of coupling between network layout and population spatial agglomeration is low，the layout of some lines is not consistent with the layout of urban functions and some stations is not reasonable. Second，the construction timing is not reasonable. The construction timing of some trunk lines and non-trunk lines is reversed，some sections of the trunk line construction result in low efficiency of channel transportation and some major stations are lagging behind，which affects the efficiency of line transportation. The ideas and suggestions for the optimization of urban rail transit network in Beijing are put forward. First，the combination of central city encryption and connecting new city，planning to build a long trunk line. Second，combining line construction with station optimization，attaching importance to station optimization. Third，combining trunk network construction with branch network planning，The network structure as “fishthorn” and “dumbbell” is formed. Forth，combing line transfer and line connection，line connection is emphasized. Fifth，the priority construction of the basic network is combined with the timely construction of special lines，and the construction timing is emphasized.